ML20236N650
| ML20236N650 | |
| Person / Time | |
|---|---|
| Site: | Turkey Point  |
| Issue date: | 11/10/1987 |
| From: | Lam P NRC OFFICE FOR ANALYSIS & EVALUATION OF OPERATIONAL DATA (AEOD) |
| To: | Novak T NRC OFFICE FOR ANALYSIS & EVALUATION OF OPERATIONAL DATA (AEOD) |
| Shared Package | |
| ML17347A635 | List: |
| References | |
| NUDOCS 8711160271 | |
| Download: ML20236N650 (3) | |
Text
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,k gnag[o UNITED STATES y
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p, NUCLEAR REGULATORY COMMISSION l
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NOV 10' 1987 i
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MEMORANDUM FOR: Thomas M. Novak', Direct 6r
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Division of Safety Peugrams, AEOD i
TFRU:
Jack E. Rosenthal, Chief
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Reactor Operations Analysis Branc e-Division of Safety Programs, AEOD FROM:
Peter Lam, Chief Reactor Systems Section W and B&W J
t Reactor Operations Analysis Branch I f j
Division of Safety Programs, AE0D
SUBJECT:
TRIP REPORT - TURKEY POINT SITE VISIT ON NOVEMBER
- 4A'iD5,1987 y
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On November 4 ird i,,1987 Eric Leeds and I visited the Turkey Point site to discuss recent' operring events involving the intake cooling water (ICW) system, A
the identificatiori of root causes of these events, the adequacy of corrective actions implemented and pb nned, and the licensee's ongoing efforts in 1CW,
l 3
system modific:tio,.g. TM site visit was conducted as a part pf twr errer*
effort in a systematic and comprehensive review, analysis and rgaluation of i
operating experience related to service water system failures and degradations.
l The topics for discusrbn in our two-day visit are listed in th enclosed agenda. Emphasis was vlaced on the following items:
i 1.
Single failure vulnerabilities of the ICW system and correct /ve actions A
implemented and phnnaA.
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The licensee had ides,tified two potential single failures of the ICW system:
a spurious closure of valve CV2202,1eading to ICW system failure; and the 4
failure of valve CY2201 to close on demand leading to ICW system flow degradation. The corrective acticns already implemented involve a hardware modification (added piping bypassing valve CY2202) ant' a procedural change (stationing a local operator on valve watch for CV??dl)., Other corrective act'iors on a longer term basis are being evaluated by the licensee.
2.
.%uling of ICW/CCW beat exchangers due to calcium carbonate deposition.
The source of the calcium carbonate is the coral and Mmestone in the ICW 3
9ooling canals. The fouling of the heat exthtngers is severe, which q
hecesspates heat exchanger performance, testing st:d cleanins about three timesAweek during summer months to enswe aceptable heatiexchanbr
.[s performance under postulated esign basis occident conditiora.
The t
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' Thomas M. Novak 2-i licensee has Installed an Amertap syst m (a system comonly used on circulating water condensers) which uses sponge balls to continuously clean the heat exchanger tubes during ICW nperation.-
3.
Licensee's options for upgrading the ICW system.
These options ' involve the replacernent of ICW system piping to eliminate.
an observed problem of structural degradation of piping where instrument taps are located due to graphite deposits; and the automatic isolation of' e part of the system serving turbine cooling from the ICW/CCW heat exchangers.
During entry end exit meetings with licensee site management, in response to a licensee fuquiry, a discussion was provided to describe beth ti1e process and the product of an AEOD case study report, and how it will be fed back to the indus try. Specifically, the following items were discussed: '(a)theprocess of initiating and conducting a t6chnical study based on a systematic review,'
analysis and evaluation of operating events; (b) AE0D management review and approval of recommendations; (c) peer review of case study reports for technical accuracy but not the reconnendations; (d) the resolution and documentation of peer review comments; (e) thr transmittal of final case study reports to program and regional offices; (f) the' tracking of recommendations until their satisfac-tory resolution; and (g) theofeedback of AEOD technical reports to the industry.
It was emphasized that the results gathered and insights gained during the' site visit would be fed back to the industry in a constructive way so that Turkey Point's operating experience would provide valuable lessons learned.
Finally, we would like to acknowledge the efforts of NRR project manager (Dan Mcdonald), the Turkey Pcint senior resident inspector (Russ Brewer), Region II representative (Mike Scott), and licensee's technical staff, who all contributed to the fruitful site visit.
ll%
Feter Lam, Chief l
Reactor Systems Section W and B&W Aeactor Operations Analysis Branch Division of Safety Programs, AEOD 4
i
Enclosure:
Agenda ec:
E. Jordar.
C. J. Heltmas V. Bensroya i
K. Black M. Williams E., Leeds
- O Mcdonald,*WRR H. Berkow, NRR R. Brewer, RII M. Scott, RII f
y
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1 AGENDA N3VEMBER 4,1987 900 9A5 htroduction of Attendees Ross Couldy.
& Opening 5totements JM.
945 10:00 PTN's intoke Cooling Tom Fisher Water System System Eng.
10:00 1045 ICW Survallimae Propom 1045 - 1Is00 Break i
lis00 - 12:00 Control of Calcium Carbonate Tom Fisher 12:00 12:30 Lunch 12:30 240 ICW Wolkdown All 240- 245 ICW LERs Toch. Dept.
245-300 ICW JC0 Ed Preest.PM Mark Kobl..PE 3:30 - 4:00 ICW Proposed Upgrade Ed Prwest 4:00 4:30 Open Discussion & NRC Requests NOVEMIER 5,1987 940. II:30 Walkdown of System i1:30 - 12:00 Lunch l
12:00 - 12:15 Closing Remarks I
RC2/059/2 l